20535416165 has 16 divisors (see below), whose sum is σ = 27063158400. Its totient is φ = 14834608320.

The previous prime is 20535416081. The next prime is 20535416179. The reversal of 20535416165 is 56161453502.

It is not a de Polignac number, because 20535416165 - 2¹⁰ = 20535415141 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1244729 + ... + 1261118.

It is an arithmetic number, because the mean of its divisors is an integer number (1691447400).

Almost surely, 2^20535416165 is an apocalyptic number.

It is an amenable number.

20535416165 is a deficient number, since it is larger than the sum of its proper divisors (6527742235).

20535416165 is a wasteful number, since it uses less digits than its factorization.

20535416165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506012.

The product of its (nonzero) digits is 108000, while the sum is 38.

Adding to 20535416165 its reverse (56161453502), we get a palindrome (76696869667).

The spelling of 20535416165 in words is "twenty billion, five hundred thirty-five million, four hundred sixteen thousand, one hundred sixty-five".